1. Construction Technology III
Group Assignment
Group Member:
1)Eng Cheng En 0331857
2)Orlando Wong Kueng Khung 0331859
3)Tan Kai Bin 0331366
4)Yong Kang Seng 0331857
2. Retaining Wall
Retaining Wall is a structure to holds or retains soil/water behind it.
There are many types of material:
-Concrete blocks
-Poured concrete
-Treated timber
-Rocks
-Boulders
3. Type of Retaining Wall:
1)Gravity Wall
2)Semi Gravity Wall
3) Reinforced Wall
4)Non-gravity Wall
4. Consideration of construct retaining wall
-Construction Time
-Budget
-Size of retaining wall
-Slope of retaining wall
-Plan for drainage
-Create a solid base (Excavation for foundation)
-Backfill adds Support
5. Gravity Retaining Wall
• Resist pressure by its own weight
• Economical up to 3m/10feet
• Type of Gravity Retaining Wall:
• Unreinforced Masonry unit, Stone, Poured concrete, Gabions, Crib
• There's various type of Gabions:
-Mattress, trapion, gabion, and bastion.
6. Semi-Gravity Retaining Wall
• Small amount of steel reinforcement , thus thinner
Reinforced Gravity Wall
• Coherent gravity structures engineered to resist specific loading requirements.
• Types of reinforced gravity wall:
• Concrete cantilever, counter-fort/Buttressed, Precast concrete, Masonry,
prestressed retaining wall
7. Case Study 1
PROPERTY DETAILS :
• Name: Solaris Dutamas (also
known as Solaris @ Dutamas) -
30m Deep Excavation for Mixed
Commercial Development
• Address: Off Jalan Duta,
Dutamas, Kuala Lumpur
• Developer: Sunrise
• Completion Date: End 2009
• Land Area: 17-acre
• 3-5 storey commercial units
• 42 storey high of office blocks
• 33 storey of service apartment
• 6 levels of basement
8. Type of Gravity Wall : Soil Nailing
• Completion of soil
nailing works and
basement
construction on-going
• During soil nailing
works
9. What is Soil Nailing Wall?
• used to bring soil stability.
• prevent landslides by inserting steel reinforcement
bars into the soil.
• known as soil nail.
Apply on:
I. Deep excavation
II. Temporary excavation shoring
III. Permanent site retaining wall
IV. Slope stabilization
V. Tunnel portal
10. Advantages of Soil Nailing System
• Does not require large working space for works.
• Relatively cheaper.
• Relatively cleaner site.
• Straightforward construction as it does not involve other trades.
- Soil Nailing - Diaphragm Wall
11. Limitation to the system
• Requires close coordination and cooperation.
• Require interfacing with foundation works.
• Requires considerable design effort.
• Ground loss due to drilling technique.
• Only suitable for excavation above groundwater table because of the
requirement to maintain the temporary unsupported excavation face.
• Requires specialized and experienced contractors as it will not cause
failure of retaining wall system.
12. Installation of
Soil Nailing
1. Excavate for
the first nail
2. Drill nail hole
3. Install and
Grout nail
4. Place
temporary facing
5. Construction of
subsequence levels
6. Place final facing
on permanent wall
13. Project detail
• Woodhouse Hotel
• Developer: T Visaman & Sons Ltd
• Architect: HB architects
• Structural engineers: GHW
Consulting Engineers
• Constructing 3 large retaining
walls
Case Study 2
14. Maufacturer
detail
• Located in UK
• manufacture precast concrete product over 50 years
• Manufacture various types of retaining walls, fencing
and cable protection
16. Stepoc
shuttering Block
What is stepoc shuttering block?
-Stepoc shuttering block is a system
that are highly-engineered and
dimensionally co-ordinated.
18. Why the project use STEPOC shuttering block
• low cost, cost him around half compare to any other method
• Fast construction, several course of blocks can be laid in a working
day even if 2 men are available
• Concrete can be easily pour into the block with a nozzle
• high strength, the special design enables vertical and horizontal
reinforcement to be placed adjacent to or either block face, or both
to achieve highest strength required
• does not demand on skilled labour, no mortar joints
19. Installation Process
• Step 1: Casting foundation. Vertical reinforcing
bars position as appropriate thereof
• Step 2: Check that the base is level
20. Installation Process
• Step3: 1st course of blocks laid on mortar to a
stretched line.
• Step4: Position horizontal reinforcement to
engineer’s requirement
21. Installation Process
• Step5: Continue to stack up blocks and place
horizontal reinforcement as the requirement
• Step 6: Check vertical faces for plumb on
completion of alternate courses
22. Installation Process
• Step7: Pump in concrete, direct the hose
along the block in order to reduce the risk of
displacing of the units
